:root {
  color-scheme: light dark;
  --bg: #f9f4ec;
  --bg-strong: #f1e7d7;
  --text: #1f2933;
  --muted: #6b7280;
  --accent: #0f766e;
  --shadow: rgba(31, 41, 51, 0.12);
}

.dark-theme {
  --bg: #0b0f14;
  --bg-strong: #121922;
  --text: #f5f3ee;
  --muted: #9aa3b2;
  --accent: #f97316;
  --shadow: rgba(0, 0, 0, 0.45);
}

@font-face {
  font-family: "Departure Mono";
  src:
    url("./fonts/DepartureMono-Regular.woff2") format("woff2"),
    url("./fonts/DepartureMono-Regular.woff") format("woff"),
    url("./fonts/DepartureMono-Regular.ttf") format("truetype");
  font-weight: normal;
  font-style: normal;
  font-display: swap;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  width: 100%;
}

body {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  font-family: "Departure Mono", monospace;
  background-color: var(--bg);
  color: var(--text);
  transition:
    background-color 0.5s ease,
    color 0.5s ease;
  overflow: hidden;
}

body::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 10% 20%, var(--bg-strong), transparent 45%),
    radial-gradient(
      circle at 80% 10%,
      rgba(15, 118, 110, 0.15),
      transparent 40%
    ),
    radial-gradient(
      circle at 30% 80%,
      rgba(249, 115, 22, 0.15),
      transparent 50%
    ),
    linear-gradient(120deg, transparent 0%, rgba(0, 0, 0, 0.04) 60%);
  pointer-events: none;
  z-index: 0;
}

nav,
main,
footer,
#theme-toggle {
  position: relative;
  z-index: 1;
}

#theme-toggle {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  padding: 0.45rem;
  background: transparent;
  border: 1px solid transparent;
  border-radius: 999px;
  cursor: pointer;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

#theme-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

#theme-toggle:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

#theme-icon {
  width: 2.25rem;
  height: 2.25rem;
  transition: transform 0.5s ease;
}

.rotate {
  transform: rotate(180deg);
}

main {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  flex-grow: 1;
  padding: 0 1.5rem;
  max-width: 38rem;
}

.eyebrow {
  font-size: 0.9rem;
  letter-spacing: 0.2rem;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 1.25rem;
}

h1 {
  font-size: clamp(2.75rem, 10vw, 7rem);
  margin: 0;
  line-height: 1;
  text-shadow: 0 12px 32px var(--shadow);
}

.subtitle {
  margin: 1rem 0 0;
  font-size: clamp(1.1rem, 2.4vw, 1.65rem);
  color: var(--muted);
}

footer {
  text-align: center;
  font-size: 0.875rem;
  color: var(--muted);
  padding: 1.25rem 0 1.5rem;
}

nav {
  position: absolute;
  top: 1.5rem;
  left: 1.5rem;
  display: flex;
  gap: 1.5rem;
  z-index: 10;
}

nav a {
  color: inherit;
  text-decoration: none;
  font-size: 0.9rem;
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease, color 0.3s ease;
}

nav a:hover,
nav a:focus-visible {
  border-bottom: 1px solid currentColor;
  color: var(--accent);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

@media (max-width: 640px) {
  nav {
    top: auto;
    bottom: 4.25rem;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    justify-content: center;
  }

  #theme-toggle {
    top: 1rem;
    right: 1rem;
  }

  .eyebrow {
    letter-spacing: 0.12rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    scroll-behavior: auto !important;
    transition: none !important;
  }
}